Use other hash than SHA-1

[Raimar Sandner]

On Friday 08 May 2009 02:09:31 David Shaw wrote:

> One fear that I've seen talked about for SHA-1 is that an attacker can
> create a duplicate document such that if you signed document or key A,
> they could come up with a document or key B that your signature would
> equally apply to.  That fear is more than a little overblown.  Even
> MD5 hasn't been broken to that extent.

http://eprint.iacr.org/2005/067.pdf

As far as I understand this paper, MD5 has been broken to that extent. For 
SHA1 you're still right of course.

Raimar
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